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R1 = Wimp_Poll reason code 1 block

This call can be used instead of the normal
Wimp_RedrawWindow/GetRectangle loop if the
window doesn't contain any graphics drawn
by your program. It does the equivalent of:

SYS "Wimp_RedrawWindow",,q% TO flag%
WHILE flag%
SYS "WimpExt_Redraw",,q%
SYS "Wimp_GetRectangle",,q% TO flag%
ENDWHILE

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